<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
<input type="text">
<input type="button" value="帅哥" onclick="f(1)">
<input type="button" value="美女" onclick="f(2)">
<hr>
<script>
  function f(x) {
    let url = x==1?"a.jpg":"b.jpg";
    let img = document.createElement("img");
    img.src = url;
    document.body.append(img)
  }
</script>
</body>
</html>